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WA caustic soda scare restaurant reopens

The fast food restaurant where at least 11 customers were injured when salt was mistakenly replaced with caustic soda has reopened.

Investigations are continuing into how the customers, including five children, needed hospital treatment after a salt shaker at a Chicken Treat store in Bunbury, 175km south of Perth, was somehow filled with caustic soda.

The powerful cleaner was apparently sprinkled over chips served at the store, leaving five children under 10 with burns to their mouths and throat.

Six adults also were harmed after eating at the restaurant, with a woman in her 20s and a man in his early 30s transferred to Perth for further treatment.

West Australian police, the Department of Health and the local council all investigated how the potentially deadly mix-up occurred, but authorities agreed the store could reopen on Monday night.

"The store reopened last evening following consultation with City of Bunbury environmental health officers and police," a Chicken Treat spokesman said.

"The internal investigation will remain open pending the ongoing police investigation."